linux-kernel - Re: [PATCH v5 3.1.0-rc4-tip 26/26] uprobes: queue signals while thread is singlestepping.

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Date:	Mon, 10 Oct 2011 17:55:56 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 3.1.0-rc4-tip 26/26]   uprobes: queue signals while
 thread is singlestepping.

* Oleg Nesterov <oleg@...hat.com> [2011-10-07 18:58:28]:

> 
> Agreed, this looks much, much better. In both cases the task is current,
> it is safe to change ->blocked.
> 
> But please avoid sigprocmask(), we have set_current_blocked().

Sure, I will use set_current_blocked().

While we are here, do you suggest I re-use current->saved_sigmask and
hence use set_restore_sigmask() while resetting the sigmask?

I see saved_sigmask being used just before task sleeps and restored when
task is scheduled back. So I dont see a case where using saved_sigmask
in uprobes could conflict with its current usage.

However if you prefer we use a different sigmask to save and restore, I
can make it part of the utask structure.

-- 
Thanks and Regards
Srikar
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